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Magnetic properties of NdFe11Ti and YFe11Ti, from experiment and theory
Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden.
Functional Materials, Department of Material Science, Technische Universität Darmstadt, Darmstadt, Germany.
Functional Materials, Department of Material Science, Technische Universität Darmstadt, Darmstadt, Germany.
Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden.
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2023 (English)In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 242, article id 118473Article in journal (Refereed) Published
Abstract [en]

NdFe11Ti and YFe11Ti serve as prototypes for rare-earth (RE) lean or REfree magnets with the ThMn12-type structure. Although NdFe11Ti has been studied for a long time the origin of its complex magnetism at low temperature is so far not well-understood. We present a comprehensive theoretical and experimental study of the magnetic properties of NdFe11Ti and RE-free YFe11Ti to elucidate the influence of the 4f electrons. The partially localized 4 f electrons of Nd are the driving force behind the complex behavior of the magnetocrystalline anisotropy which changes from cone to uniaxial above 170 dK. The spontaneous magnetization and the five leading anisotropy constants were determined from high-quality single crystal samples over a wide temperature range using field dependencies of magnetization measured along the principle crystallographic directions. The experimental data are compared with density functional theory combined with a Hartree-Fock correction (+U) and an approximate dynamical mean-field theory.

Place, publisher, year, edition, pages
Elsevier, 2023. Vol. 242, article id 118473
Keywords [en]
Permanent magnets, Rare-earths, Anisotropy, Magnetism, DFT, DMFT
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:oru:diva-103994DOI: 10.1016/j.actamat.2022.118473ISI: 000908332400005Scopus ID: 2-s2.0-85141341634OAI: oai:DiVA.org:oru-103994DiVA, id: diva2:1733417
Funder
EU, Horizon 2020, EU 686056Swedish Foundation for Strategic Research, EM16-0 039Swedish Energy AgencySwedish Research Council
Note

Funding agency:

German Research Foundation (DFG) 405553726-TRR 270

Available from: 2023-02-02 Created: 2023-02-02 Last updated: 2023-02-02Bibliographically approved

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Eriksson, Olle

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